肺炎支原体感染的血清学检测方法比较

目的比较几种检测方法对呼吸道感染患者血清肺炎支原体（MP）特异性抗体IgM检测的检出率。方法以冷凝集试验（CAT）、明胶颗粒凝集法（PLA）、酶联免疫吸附试验（ELISA）3种方法对95例呼吸道感染患者血清肺炎支原体IgM抗体进行检测。结果冷凝集试验、明胶颗粒凝集法、酶联免疫吸附试验检测血清肺炎支原体IgM抗体的敏感性分别为69.1%、96.4%和90.9%,特异性分别为75%、100%和90%,准确度分别为68.4%、97.9%和90.5%。用配对资料四格表法对三种方法的检出率进行分析,经SPSS软件统计分析,冷凝集试验与明胶颗粒凝集法和酶联免疫吸附试验相比较,差异有统计学意义（P〈0.05）,酶联免疫吸附试验与明胶颗粒凝集法相比较,差异无统计学意义（P〉0.05）。结论冷凝集试验与另外两种方法相比有显著差异,而酶联免疫吸附试验与明胶颗粒凝集法两种方法没有显著差异,两者联合应用可以提高阳性率,对临床治疗起到及时的指导。     

军队医学图书馆文献资源的共建共享

阐述了军队医学图书馆文献信息资源共建共享的意义及开展的情况,提出了深入发展军队医学图书馆文献信息资源共建共享的建议。     

Preparation and characterisation of polylactic acid modified polyurethane microcapsules for controlled-release of chlorpyrifos

Polyurethane modified with polylactic acid microcapsules were fabricated for controlled release of chlorpyrifos (one of the high usage solid phosphorous insecticides) via interfacial polymerisation with diphenylmethane diisocyanate, polyether triol, 1,4-butanediol and polylactic acid as modifier. The structure, morphology and release properties of synthesised microcapsules were characterised by Fourier transform infra-red spectroscopy, thermogravimetric analyser, scanning electron microscope, particle size analyser and high-performance liquid chromatography. More benign solvents, namely ethyl acetate and n-butyl acetate were used as replacement for toxic solvents commonly used in the preparation of polyurethane microcapsules, namely xylene. The spherical microcapsules prepared in this study were 1–20?μm in diameter. Fourier transform infra-red spectroscopy indicated that polylactic acid had successfully participated in the interfacial polymerisation of polyurethane. Encapsulation efficiency of microcapsules can amount up to 71.0% w/w with a loading efficiency of 26.2% w/w. The microcapsules exhibited a sustained release period above 60?days. Combining polylactic acid into the soft segment of polyurethane proves to effectively accelerate the release rate.     

High-content analysis for mitophagy response to nanoparticles: A potential sensitive biomarker for nanosafety assessment

Mitophagy, a selective autophagy of mitochondria, clears up damaged mitochondria to maintain cell homeostasis. We performed high-content analysis (HCA) to detect the increase of PINK1, an essential protein controlling mitophagy, in hepatic cells treated with several nanoparticles (NPs). PINK1 immunofluorescence-based HCA was more sensitive than assays and detections for cell viability and mitochondrial functions. Of which, superparamagnetic iron oxide (SPIO)-NPs or graphene oxide-quantum dots (GO-QDs) was selected as representatives for positive or negative inducer of mitophagy. SPIO-NPs, but not GO-QDs, activated PINK1-dependent mitophagy as demonstrated by recruitment of PARKIN to mitochondria and degradation of injured mitochondria. SPIO-NPs caused the loss of mitochondrial membrane potential, decrease in ATP, and increase in mitochondrial reactive oxide species and Ca²⁺. Blocking mitophagy with PARKIN siRNA aggravated the cytotoxicity of SPIO-NPs. Taken together, PINK1 immunofluorescence-based HCA is considered to be an early, sensitive, and reliable approach to evaluate the bioimpacts of NPs.     

军队医院在非战争军事行动中药材保障的做法与探讨

目的 探讨部队医院在非战争军事行动中的药材保障方法.方法 以医院在抗击非典和甲流、载人航天实验任务、抗震救灾、奥运会等非战争军事行动中的药材保障做法为基础,进行总结和分析.结果 非战争军事行动药材需求和保障有其特点,可引入现代药材保障的新技术、新方法,提高非战争军事行动药材保障能力.结论 非战争军事行动中药材保障是非战争军事行动卫勤保障的重要组成部分,需要在实际行动中不断总结经验,开展系统研究,提高保障能力.     

Umbelliferone induces changes in the structure and pharmacological activities of Bn IV, a phospholipase A2 isoform isolated from Bothrops neuwiedi

In this paper was demonstrated that umbelliferone induces changes in structure and pharmacological activities of Bn IV, a lysine 49 secretory phospholipase A₂ (sPLA2) from Bothrops neuwiedi. Incubation of Bn IV with umbelliferone virtually abolished platelet aggregation, edema, and myotoxicity induced by native Bn IV. The amino acid sequence of Bn IV showed high sequence similarities with other Lys49 sPLA2s from B. jararacussu (BthTx-I), B. pirajai (PrTx-I), and B. neuwiedi pauloensis (Bn SP6 and Bn SP7). This sPLA2 also has a highly conserved C-terminal amino acid sequence, which has been shown as important for the pharmacological activities of Lys49 sPLA2. Sequencing of Bn IV previously treated with umbelliferone revealed modification of S(1) and S(20). Fluorescent spectral analysis and circular dichroism (CD) studies showed that umbelliferone modified the secondary structure of this protein. Moreover, the pharmacological activity of Bn IV is driven by synergism of the C-terminal region with the α-helix motifs, which are involved in substrate binding of the Asp49 and Lys49 residues of sPLA2 and have a direct effect on the Ca²⁺-independent membrane damage of some secretory snake venom PLA2. For Bn IV, these interactions are potentially important for triggering the pharmacological activity of this sPLA2.     

脂蛋白相关磷酸酶A2和炎性蛋白在诊断脑梗死后血管性痴呆及判断预后中的应用

目的探讨脂蛋白相关磷酸酶A2(Lp⁃PLA2)、炎性蛋白[超敏C反应蛋白(hs⁃CRP)、白介素⁃6(IL⁃6)]在脑梗死后血管性痴呆(VD)诊断及预后中的应用价值。方法选取2018年6月至2019年7月本院收治的75例单纯脑梗死患者(无VD组)及60例脑梗死后VD患者(VD组),比较两组临床资料,通过酶联免疫吸附法检测血清Lp⁃PLA2、IL⁃6水平,通过干式免疫层析技术检测血清hs⁃CRP水平,采用Logistic回归性分析影响脑梗死后VD发生的危险因素,采用受试者工作特征曲线(ROC)及曲线下面积(AUC)分析各指标诊断脑梗死后VD的价值,采用Pearson分析各指标与美国国立卫生研究院卒中量表(NIHSS)、日常生活活动能力量表评分(ADL)之间的相关性。结果VD组NIHSS、ADL评分及血清Lp⁃PLA2、hs⁃CRP、IL⁃6均较无VD组高(P<0.05);年龄、Lp⁃PLA2、hs⁃CRP、IL⁃6均为影响脑梗死后VD发生的相关危险因素(P<0.05);诊断脑梗死后VD的AUC IL⁃6>hs⁃CRP>Lp⁃PLA2;Lp⁃PLA2、hs⁃CRP和IL⁃6与NIHSS评分呈正相关(P<0.05),与ADL评分呈负相关(P<0.05)。结论Lp⁃PLA2、hs⁃CRP和IL⁃6在脑梗死后VD患者中高表达,且明显与患者预后评分相关,可辅助VD诊断及评估患者功能预后。     

改良自乳化溶剂扩散法制备MePEG-PLA纳米粒对成骨细胞的毒性*

两亲性嵌段聚合物由于其较强的载药能力强、纳米级大小、血液中长循环等优点在载药系统中得到广泛的应用。 目的：评估改良自乳化溶剂扩散法制备的甲氧基封端的聚乙二醇-聚乳酸 (MePEG-PLA)纳米粒对人骨肉瘤细胞MG63的毒性。 方法：通过改良自乳化溶剂扩散法制备MePEG-PLA纳米粒,MTS法测定纳米粒培养1,2,3 d后对MG63的毒性。激光粒度分析仪测定纳米颗粒的粒径大小、粒径分布及Zeta电位;透射电镜表征纳米胶束外观形态;酶标仪检测培养1,2,3 d细胞吸光度值。 结果与结论：MePEG-PLA纳米粒的平均粒径为25.7 nm,分布均匀,呈球形,Zeta电位为-8.06 mV,MePEG-PLA毒性为 0级。提示改良自乳化溶剂扩散法制备纳米粒简单易行,制备的纳米粒无毒,具有良好的应用前景。     

Different metabolic profiles of K1 serotype and non-serotype K1 and K2 Klebsiella pneumoniae isolates in oral infection mice model

K1 or K2 serotype Klebsiella pneumoniae isolate caused clinical pyogenic liver abscess (KLA) infection is prevalent in many areas. It has been identified that K1 or K2 serotype K. pneumoniae isolates caused KLA infection in mice by oral inoculation. In our study, K1 serotype K. pneumoniae isolate Kp1002 with hypermucoviscosity (HV)-positive phenotype caused KLA infection in C57BL/6 mice by oral inoculation. Simultaneously, non-serotype K1 and K2 isolate Kp1014 with HV-negative phenotype failed to cause KLA infection in the same manner. It seems that gastrointestinal tract translocation is the pathway by which K1 or K2 serotype K. pneumoniae caused KLA infection. Liquid chromatography-tandem mass spectrometry was used to further analyze metabolic profile changes in mice with KLA infection. Data showed that after Kp1002 or Kp1014 oral inoculation, serum Phosphatidylcholine (PC) and Lysophosphatidylcholine (LPC) levels significantly changed in mice. Some PC and LPC molecules showed changes both in the Kp1002 KLA group and the Kp1014 no-KLA group compared with the control group. The level of 18:1/18:2-PC significantly changed in the Kp1002 KLA group compared with the control group, but showed no change between the Kp1014 no-KLA group and the control group. The level of 18:1/18:2-PC might have been particularly affected by KLA infection caused by K1 serotype K. pneumoniae Kp1002. It may be a potential biomarker for KLA infection.     

Oppositely Synchronized Lamellar Bending in Poly(l‐lactic acid) Versus Poly(d‐lactic acid) Blended with Poly(1,4‐butylene adipate)

Lamellar bending habits, as influenced by molecular‐chain chirality, in packing into dendritic spherulites with specific optical patterns are discussed using two model polymers of opposite chirality that are blended with a common polymer as examples: i) poly(l ‐lactic acid)/poly(butylene adipate) (PLLA/PBA) and ii) poly(d ‐lactic acid)/PBA (PDLA/PBA) blends. The bending habits in the spherulites of PLLA or PDLA blended with PBA are dictated by the chirality, specifically the counterclockwise and clockwise directions for the PLLA/PBA (50:50) and PDLA/PBA (50:50) blends, respectively. Straight lamellae in spiral lozenge crystals are packed with crystal aggregates of PLLA on top of the flat‐on lamellae plates acting as a basal plane during crystallization at T_c; spiral lozenge‐crystal frameworks are surrounded by needle‐like crystals resembling PBA crystals.